We have reported earlier about Audi’s travolution technology, but now we have some more intel. Enjoy!
Audi has now developed travolution still further, by enabling vehicles to communicate directly with traffic light systems, using wireless LAN and UMTS links. 15 test vehicles and 25 sets of traffic lights now permit the system to be sampled in actual traffic conditions in the city on the Danube.
The traffic signals transmit data that are processed into graphic form and shown on the car’s driver information display screen. The graphics tell the driver for instance what speed to adopt so that the next traffic light changes to green before the car reaches it. This speed, which keeps the traffic flowing as smoothly as possible, can then be selected at the adaptive cruise control (ACC) – but the driver can also delegate this task to the car’s control system.
If the car is stopped at a red traffic light, this transmits information via the car’s computer on how long the driver will have to wait before it switches to green again. If on the other hand the car approaches a traffic light that is about to switch to yellow or red, the driver is warned by a visual or acoustic signal, or by a brief interruption to the flow of power from the engine.
When the car is part of a network in this way, the driver can reduce the amount of time spent at a standstill and cut fuel consumption by 0.02 of a litre for every traffic-light stop and subsequent acceleration phase that can be avoided. The potential is enormous: if this new technology were applied throughout Germany, exhaust emissions could be lowered by about two million tonnes of CO2 annually, equivalent to a reduction of approximately 15 percent in CO2 from motor vehicles in urban traffic.